Tight Uterus: Orgasm?

Stephanie • Mother of a sweet little boy (11/13/16) and little girl (08/30/2018)! 2 MCs (12/20/2015 and 7/25/2017)
I was having a dream and think I had a very quick orgasm. When I woke up my uterus was really tight. A little scared. Had this happen in my sleep but never with the tightening. Is everything ok? Baby has been kicking this morning. 😬